bZ3纯电动轿车的空气动力性能开发

作为比亚迪丰田电动车科技有限公司第1款纯电动轿车，bZ3的能耗要求极高，也给空气动力学性能开发带来了很大的挑战。为实现这一目标，通过采用计算流体力学（Computational Fluid Dynamics,CFD）仿真和风洞试验相结合的方法，对车身造型、车底、前舱进气管理、车轮、密封等部位进行了持续的优化验证。最终bZ3在风洞中进行实车试验验收，空气阻力系数达到0.218，在同级别车型中处于领先水平。通过两种不同仿真方法对比研究发现格子玻尔兹曼（Lattice Boltzmann Method,LBM）方法整体精度较高，但对于底部气流的模拟精度还有待提升。

Development of Aerodynamic Performance of the bZ3

As the first pure electric sedan of BYD TOYOTA EV Technology Co., Ltd, the bZ3 has extremely high energy consumption requirements, which brings great challenges to its aerodynamic development. To achieve this target, CFD simulations and wind tunnel tests were conducted by the aerodynamics team. Optimizations were primarily focused on areas including styling, undercover design, cooling air inlet management, wheels and sealing. The final production car was tested in the wind tunnel, achieving a drag coefficient of 0.218, which is at a leading level among vehicles in its class. Different CFD methods were compared with test results, showing that the LBM has better accuracy, although its precision in simulating underbody airflow still needs to be improved.